8000 NoSuchMethodError: The setter 'value=' was called on null. · Issue #22 · peng8350/flutter_pulltorefresh · GitHub
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NoSuchMethodError: The setter 'value=' was called on null. #22

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stefanJi opened this issue Oct 30, 2018 · 1 comment
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NoSuchMethodError: The setter 'value=' was called on null. #22

stefanJi opened this iss 8000 ue Oct 30, 2018 · 1 comment

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@stefanJi
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When I firstly call refreshController.sendBack in initState firstly, will throw NoSuchMethodError: The setter 'value=' was called on null.

As follows code:

abstract class BaseListState extends State<BaseListWidget>
    with AutomaticKeepAliveClientMixin<BaseListWidget> {
   RefreshController _refreshController = RefreshController();
   List data;

  @override
  void initState() {
    super.initState();
    _loadNew();
  }

  _loadNew() async {
    final remoteDate = await _loadData();
    if (mounted) {
      setState(() {
        data = remoteDate;
      });
      _refreshController.sendBack(true, RefreshStatus.completed);
      if (page == total) {
        _refreshController.sendBack(false, RefreshStatus.noMore);
      } else {
        _refreshController.sendBack(false, RefreshStatus.canRefresh);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return data == null
        ? Center(child: CircularProgressIndicator())
        : SmartRefresher(
            controller: _refreshController,
            enablePullDown: true,
            enablePullUp: true,
            onRefresh: (up) {
              if (up) {
                _loadNew();
              } else {
                _loadMore();
              }
            },
            child: ListView.builder(
                itemCount: data == null ? 0 : data.length,
                itemBuilder: (context, index) {
                  return childBuild(context, index);
                }));
  }
}
@stefanJi
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stefanJi commented Nov 8, 2018

I have work around this issue. As following :

return SmartRefresher(
        controller: _refreshController,
        onRefresh: (up) {
          if (up) {
            if (!_hasLoadOnce) {
              _hasLoadOnce = true;
            }
            _loadNew();
          } else {
            _loadMore();
          }
        }
);

_loadNew( ) {
    if (_hasLoadOnce) {
        _refreshController.sendBack(true, RefreshStatus.completed);
    }
}

@stefanJi stefanJi closed this as completed Nov 8, 2018
@ycyranqingjjs ycyranqingjjs mentioned this issue Aug 9, 2019
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@gxg-886 gxg-886 mentioned this issue Nov 25, 2019
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@tupobi tupobi mentioned this issue Jun 15, 2020
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@wangruofeng wangruofeng mentioned this issue Apr 19, 2021
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@xiaochenghua xiaochenghua mentioned this issue Mar 24, 2023
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